초록 ▼

An electronic delay detonator for igniting an ignition resistor a predetermined delay time after supply of electric power from a blasting machine comprises two input terminals for receiving the electric power supplied from the blasting machine, a diode-bridge circuit connected to the input terminals

An electronic delay detonator for igniting an ignition resistor a predetermined delay time after supply of electric power from a blasting machine comprises two input terminals for receiving the electric power supplied from the blasting machine, a diode-bridge circuit connected to the input terminals, a power supply capacitor connected to the output of the diode bridge circuit, an RC charging circuit connected in parallel with the capacitor and having a predetermined time constant, and a monolithic IC. The monolithic IC includes a reference generation circuit for generating a compare reference voltage by dividing the power supply by dividing resistors, a voltage comparator for comparing the voltage charged in the capacitor of the charging circuit with the compare reference voltage, a signal latch circuit for holding the output of the comparator and a transistor current switching circuit responsive to the output of the signal latch circuit to for supplying the electric energy of the power supply capacitor to the ignition resistor of the detonator. The overall circuit is in a hybrid IC module. A resistor having a constant resistance sufficiently distinguishable from an internal resistance of the detonator is connected across the two input terminals to bypass a stray current and enable checking of connection continuity of series-connected detonators.

대표청구항 ▼

An electronic delay detonator, in a hybrid IC configuration, for igniting an ignition device through an ignition resistor a predetermined delay time after supply of electrical energy, comprising: input terminal means for supplying the electrical energy to said electronic delay detonator; a first cap

An electronic delay detonator, in a hybrid IC configuration, for igniting an ignition device through an ignition resistor a predetermined delay time after supply of electrical energy, comprising: input terminal means for supplying the electrical energy to said electronic delay detonator; a first capacitor for storing the electrical energy; release prevention means, connected between said input terminal means and said first capacitor, for preventing the electrical energy supplied through said input terminal means and stored in said first capacitor from being released; time constant circuit means, connected in parallel with said first capacitor and including a second capacitor and a first resistor, for charging the electrical energy supplied from said input terminal means at a rate whose time constant, which corresponds to said predetermined delay time, is determined by the product of a capacitance of said second capacitor and a resistance of said first resistor; reference voltage generation circuit means, including a voltage divider connected across said first capacitor, for generating a compare reference voltage; voltage comparator means for comparing the charged energy of said time constant circuit means with the compare reference voltage of said reference voltage generating circuit means to produce an output signal when the charged energy exceeds the compare reference voltage; and transistor current switching circuit means, responsive to the output signal of said voltage comparator means, for establishing an electrical path to supply the electrical energy stored in said first capacitor to said ignition resistor of said ignition device.